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400G QSFP-DD SR8 850 nm 100 m

Ascent’s QSFP-DD-400G-LP-01 is a 400 Gb/s Quad Small Form Factor Pluggable-double density (QSFP-DD) optical module designed for short-range optical communication applications. The module is designed to operate over multi-mode fiber systems using a nominal wavelength of 850 nm. The electrical interface uses a 76-pins connector, and the optical interface uses an MPO connector.

    Compliant to QSFP-DD MSA

    Compliant with IEEE 802.3cd

    Supports 400 Gb/s aggregate bit rate

    Up to 53.125 Gbps data rate per channel

    Up to 70 m link length on OM3 and 100 m on OM4

    MPO connector receptacle

    Case temperature range: 0 °C to +70 °C

    Power dissipation < 10 W

    RoHS compliant


Absolute Maximum Ratings 

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Storage Temperature

TS

‑40


+85

°C


Relative Humidity

RH

5


85

%


Power Supply Voltage

VCC

‑0.4


3.6

V


Recommended Operating Conditions

Recommended operating environment specifies parameters for which the electrical and optical characteristics hold unless otherwise noted.

Parameter

Symbol

Min.

Typ.

Max.

Unit

Notes

Operating Case Temperature

TC

0

+70

°C


Supply Voltage

VCC

3.135

3.3

3.465

V


Supply Current

ICC



2730

mA


Bit Rate

BR


400


Gbps


Data Rate, Each Lane



26.5625


GBd


Data Rate Accuracy


‑100


100

ppm


Fiber Length (OM3 MMF)




70

m


Fiber Length (OM4 MMF)




70

m


Optical Characteristics 

Parameter

Symbol

Min

Typ.

Max

Unit

Notes

Transmitter

Modulation Format



PAM4




Signaling Rate, Each Lane (Range)


26.5625 ± 100 ppm

GBd


Center Wavelength

λ0

840


860

nm


Spectral Width (RMS)

σ



0.6

nm

1

Average Launch Power, Each Lane


‑6


4

dBm


Outer Optical Modulation Amplitude (OMAouter), Each Lane


‑4.0


3

dBm

2

Launch Power in OMAouter ‑ TDECQ


‑5.9



dBm


Transmitter and Dispersion Eye Closure (TDECQ), Each Lane

TDECQ



4.9

dBm


Average Launch Power of OFF Transmitter, Each Lane




‑30

dBm


Extinction Ratio, Each Lane

ER

3



dB


Optical Return Loss Tolerance

ORL



12

dB


Receiver

Modulation Format


PAM4



Data Rate, Each Lane


26.5625 ± 100 ppm

GBd


Receiver Wavelength

λ

840


860

nm


Damage Threshold


5



dBm

3

Average Receive Power, Each Lane


‑7.8


4

dBm

4

Receive Power (OMAouter), Each Lane




3

dBm


Receiver Reflectance 

RR



‑12

dB


Stressed Receiver Sensitivity (OMAouter), Each Lane

RSENS



‑3

dBm


Receiver Sensitivity (OMAouter), Each Lane (Max.)

RS = max(‑6.5, SECQ ‑ 7.9)

dB

5

Difference in Launch Power between any Two Lanes (OMAouter)




4.6

dBm


Conditions of Stressed Receiver Sensitivity Test

Stressed Eye Closure for PAM4 (SECQ), Lane under Test



4.9


dB

6

OMAouter of Each Aggressor Lane



3


dBm

6

Notes: 

1. RMS spectral width is the standard deviation of the spectrum

2. Even if the TDECQ < 1.9 dB, the OMA (min) must exceed this value.

3. The receiver shall be able to tolerate, without damage, continuous exposure to an optical input signal having this average power level on one lane. The receiver does not have to operate correctly at this input power.

4. Average receive power, each lane (min) is informative and not the principal indicator of signal strength. A received power below this value cannot be compliant; however, a value above this does not ensure compliance.

5.Receiver sensitivity is informative and is defined for a transmitter with a value of SECQ.

6. These test conditions are for measuring stressed receiver sensitivity. They are not characteristics of the receiver.

Electrical Characteristics 

Parameter

Symbol

Min

Typ.

Max

Unit

Notes

Supply Voltage

VCC

3.135

3.3

3.465

V


Supply Current

Icc



2730

mA


Transmitter

Input Differential Impedance

Rin


100


Ω

1

Differential Data Input Swing

Vin,pp

400


900

mV


Receiver

Differential Data Output Swing

Vout,pp



900

mV

2

Notes

1. Connected directly to TX data input pins.

2. In to 100 Ω differential termination

Digital Diagnostic Monitoring Information

Parameter

Accuracy

Calibration

Temperature

±3 °C

Internal

Voltage

±3 %

Internal

Bias Current

±10 %

Internal

TX Power

±3 dB

Internal

RX Power

±3 dB

Internal

 


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